Slot of an electric machine - QuickField simulation example
This is an example of the slot of an electric machine simulation, performed with QuickField software.
How to calculate temperature distribution in the stator tooth zone of an electric machine?
Answer Typical applications Geometry
All dimensions are in millimeters. Domain is a 10-degree segment of the stator section. Two armature bars laying in the slot generate ohmic loss. Cooling is provided by convection to the axial cooling duct and both surfaces of the core.
Given
Task
Solution
Results
Engineering question
Use one stator-slot sector by symmetry, apply copper loss as a volumetric heat source and the specified convection on the cooled surfaces, and solve the steady-state temperature field.
electric machine stator slots, stator tooth regions, winding slot structures
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Simulation problem
Problem Type
Plane-parallel problem of heat transfer.
Specific copper loss Q = ρ*j*j = (1 / 56MS/m) * 3A/mm² * 3A/mm² = 160 kW/m³;
Thermal conductivity of materials: steel 25 W/K-m, copper 380 W/K-m, insulation 0.15 W/K-m, wedge 0.25 W/K-m.
Outer stator surface convection coefficient 10 W/K-m², air temperature 20°C.
Cooling duct convection coefficient 50 W/K-m², air temperature 40°C.
Inner stator surface convection coefficient 70 W/K-m², air temperature 40°C.
Temperature distribution in the stator tooth and slot region of an electric machine, including heat sources and thermal paths through the slot materials.
Due to model symmetry only a single slot is included in the model.
QuickField automatically assigns zero heat flux boundary condition on external boundaries.
Temperature distribution in a slot of an electric machine:
Video
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